Manufacture of inverted mantles.



E. L. KNOEDLBR.

MANUFAGTURE 0F INVBRTED MANTLES.

APPLIOATION FILED FEB. 17, 1911.

Patented May 20, 1913.

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LUVESTUS KNOEDIIERZ, OF GLOUCESTER CITY, JERSEY, .ASSIGNOR- T0'WELSBACI-I LEG-'HT COMPANY, GF GEOUCESTER. CITY, NEW JERSEY, A.CORPORATION or Newer-insista'.

MANUFAGTURE 0F INVERTEID MANTLES.

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Specification of Letters Patent.

Patented May 20,1913,

T 0 all 'whom t may concern.'

Be it known that I, ELMER L. KNOEDLER, a resident of Gloucester City, inthe county of Camden, State of` New Jersey, have invented a new anduseful Improvement in Manufacture of Invertedl Mantles, of which thefollowing is a full, clear, and exact description, reference being hadto the accompanying drawings, lforming part of this specification, inwhich- Figure 1 -is a perspective view of the post which I employ Fig. 2is a similar view of the Weighted ring usedwith said post; Fig. 3 is apartial side elevation showing the manner of tying the mantle on thebase ring; Fig. 4 is a perspective View of the doubled loop employed inthe string; Fig. 5 is a side elevation of the mantle tied to the ring,showing in dot-ted lines the position for shirring; and Fig. 6 is a sideelevation of the nished mantle.

My invention relates to the manufacture of mantles for invertedincandescent gas lamps, and is designed to provide an improved method ofand apparatus for tying the base of the mantle to the base ring.

To that end, the invention consists in forming a double loop of the cordwhich will largely prevent ununiform contraction of the .mantle on thering, and equalize the side drawing act-ion on the mantle.

It further consists in using a weighted ring to yieldingly hold therefractory base ring in position on the base and further in theconstruction and arrangement of the parts, as hereinafter more fullydescribed and set forth in the claims.

In carrying out my invention, I employ a cylindrical post 2, preferablyof wood or similar material, which may be secured to a suitable base.The upper end of this post has a rounded edge 3, and its top is providedwith three radial grooves or recesses 4, to receive the radial legs ofthe usual base ring of the mantle. In the center of the post is provideda vertical cylindrical pin 5 with a rounded top, the lower portion ofthis pin having an enlarged annular portion 6,'which is cut through bythe radial slots 4. This enlarged portion 6 is finished to loosely fitthe interior of the mantle ring. With this post device, I employ theweighted ring 7 of Fig. 2, this being preferably of metal to give it thedesired weight, and having a hole to slip loosely over the pin 5.

In the use of the device, the mantle ring shown, for example, at 8', inF ig. 6, is slipped down over the pin 5 and around the enlarge'- ment 6,with its legs in the radial grooves or recesses of the post. Theweighted ring is then dropped on the pin and rests on the enlargement 6to yieldingly hold the mantle ring in place, and the mantle blank in theform of a knitted cylinder is then drawn over the ring 7 and the post.'This action stretches the mantle, the post being of larger diameterthan the normal size of the mantle. lThe mantle blank is drawn downuntil its upper end is properly positioned around the mantle base ring,and the tying cord is then drawn around this base ring with two loops,as shown in Fig. 4. These loops are then drawn tight and as. they aredrawn by the knot at one side, the left hand portion of one loop willmove in one direction, while the left hand portion of the other loopwill move in the other direction, this being the same on the right handside. It is therefore evident that by using the two loops, the sidewisedraw on the mantle is equalized, so that there is no tendency to pullthe mantle around toward the knot. If a single loop is used, as the knotis drawn tight, the mantle fabric is drawn around toward the knot andthe mantle fabric must then be pulled back and equalized by theoperator. The double loop formation does away with this diiiculty andequalizes the draw at the different points, thus pulling the mantlefabric equally toward the aXis of the ring. The knot is then tied by theoperator, t-he ring 7 removed, the mantle pulled oft' and turned backinto the position shown in Fig. 5, where 9 is the mantle and 8 themantle ring. The mantle can then be pushed back through the ring in theposition shown in dotted lines in Fig. 5, for the shirring operation,and after shirring, it is pushed back giving t-he mantle of Fig. 6.

The advantages of my invention result from the double looped cordemployed in tying and from the use of the weighted ring for holding themantle ring yieldingly in place. vIf positive locks or hold-down devicesfor the legs are employed, it has been found that the legs are liable tobreak oif,

thus destroying the ring and reducing the output. The weighted ringholds the mantle ring yieldingly in place, and at the same time, doesnot cause breakage. The plural looped cord equalizes the radial inwarddraw and prevents the puckering resulting from a single cord drawing themantle malzerial around circumferentially toward the (not.

Changes may be made in the form and arrangement of the post, the cord,etc., without departing from my invention.

The novel form of tie herein shown and described forms the subjectmatter of a divisional applica-tion Serial No. 7 50,053, filed February24th, 1913.

I claim:

l. In mantle manufacture, a cylindrical post of larger diameter than thenormal diameter of the mantle, a central boss on the top of said postfor engaging the inner wall of the mantle ring for centering said ring,a pin extending upwardly from said boss, said post being provided withtop slots for receiving the mantle ring legs; substantially asdescribed.

2. In mantle manufacture, a cylindrical post of larger diameter than theVnormal diameter of the mantle, a central boss on the top of said postfor engaging the inner .wall of the mantle ring for centering said ring,a pin extending upwardly from said boss, said post being provided withtop slots for receiving the mantle ring legs, and a weight-v ed ringcoperating with said pin for retaining the mantle ring in position onthe post; substantially as described.

3. In mantle manufacture, a cylindrical post of larger diameter than thenormal diameter of the mantle, va central boss on the top of said postfor engaging the inner wall of the mantle ring and extending slightlyabove the mantle ring when in position on the post, said post beingprovided with top slots for receiving the mantle ring legs, and aweighted ring supported on the top of said boss for retaining the mantlering in position, substantially as described.

In testimony whereof, I have hereunto set my hand.

Y ELMER LUVESTUS KNOEDLER. Witnesses:

J. I-I. JoHNsoN, J. R. IRELAND.

Copies of this patent may be obtained for ve cents each, py addressingthe Commissioner of Patents,

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